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# PetscIntSumTruncate
Computes the sum of two positive `PetscInt` and truncates the value to slightly less than the maximal possible value 
## Synopsis
```
static inline PetscInt PetscIntSumTruncate(PetscInt a, PetscInt b)
```
Not Collective; No Fortran Support


## Input Parameters

- ***a -*** the `PetscInt` value
- ***b -*** the second value



## Returns
the result as a `PetscInt` value




## Notes
Use `PetscInt64Mult()` to compute the product of two `PetscInt` as a `PetscInt64`

Use `PetscRealIntMultTruncate()` to compute the product of a `PetscReal` and a `PetscInt` and truncate to fit a `PetscInt`

Use `PetscIntMultError()` to compute the product of two `PetscInt` if you wish to generate an error if the result will not fit in a `PetscInt`


## Developers Notes
This is used where we compute approximate sizes for workspace and need to insure the workspace is index-able.


## See Also
 `PetscBLASInt`, `PetscMPIInt`, `PetscInt`, `PetscBLASIntCast()`, `PetscInt64Mult()`, `PetscIntMultError()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscsys.h.html#PetscIntSumTruncate">include/petscsys.h</A>


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